Calculus Examples

$y = \ln ({(\frac{4 x^{2}}{5 x^{5} + 4})}^{4})$

Step 1

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} (\ln ({(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}))$

Step 2

The derivative of $y$ with respect to $x$ is $y'$ .

$y'$

Step 3

Differentiate the right side of the equation.

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Step 3.1

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \ln (x)$ and $g (x) = {(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}$ .

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Step 3.1.1

To apply the Chain Rule, set $u_{1}$ as ${(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}$ .

$\frac{d}{d u_{1}} [\ln (u_{1})] \frac{d}{d x} [{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}]$

Step 3.1.2

The derivative of $\ln (u_{1})$ with respect to $u_{1}$ is $\frac{1}{u_{1}}$ .

$\frac{1}{u_{1}} \frac{d}{d x} [{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}]$

Step 3.1.3

Replace all occurrences of $u_{1}$ with ${(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} \frac{d}{d x} [{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}]$

Step 3.2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{4}$ and $g (x) = \frac{4 x^{2}}{5 x^{5} + 4}$ .

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Step 3.2.1

To apply the Chain Rule, set $u_{2}$ as $\frac{4 x^{2}}{5 x^{5} + 4}$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (\frac{d}{d u_{2}} [{u_{2}}^{4}] \frac{d}{d x} [\frac{4 x^{2}}{5 x^{5} + 4}])$

Step 3.2.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{2}} [{u_{2}}^{n}]$ is $n {u_{2}}^{n - 1}$ where $n = 4$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (4 {u_{2}}^{3} \frac{d}{d x} [\frac{4 x^{2}}{5 x^{5} + 4}])$

Step 3.2.3

Replace all occurrences of $u_{2}$ with $\frac{4 x^{2}}{5 x^{5} + 4}$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (4 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{d}{d x} [\frac{4 x^{2}}{5 x^{5} + 4}])$

Step 3.3

Differentiate using the Constant Multiple Rule.

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Step 3.3.1

Since $4$ is constant with respect to $x$ , the derivative of $\frac{4 x^{2}}{5 x^{5} + 4}$ with respect to $x$ is $4 \frac{d}{d x} [\frac{x^{2}}{5 x^{5} + 4}]$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (4 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} (4 \frac{d}{d x} [\frac{x^{2}}{5 x^{5} + 4}]))$

Step 3.3.2

Multiply $4$ by $4$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{d}{d x} [\frac{x^{2}}{5 x^{5} + 4}])$

Step 3.4

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = x^{2}$ and $g (x) = 5 x^{5} + 4$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{(5 x^{5} + 4) \frac{d}{d x} [x^{2}] - x^{2} \frac{d}{d x} [5 x^{5} + 4]}{{(5 x^{5} + 4)}^{2}})$

Step 3.5

Differentiate.

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Step 3.5.1

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{(5 x^{5} + 4) (2 x) - x^{2} \frac{d}{d x} [5 x^{5} + 4]}{{(5 x^{5} + 4)}^{2}})$

Step 3.5.2

Move $2$ to the left of $5 x^{5} + 4$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 \cdot (5 x^{5} + 4) x - x^{2} \frac{d}{d x} [5 x^{5} + 4]}{{(5 x^{5} + 4)}^{2}})$

Step 3.5.3

By the Sum Rule, the derivative of $5 x^{5} + 4$ with respect to $x$ is $\frac{d}{d x} [5 x^{5}] + \frac{d}{d x} [4]$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 (5 x^{5} + 4) x - x^{2} (\frac{d}{d x} [5 x^{5}] + \frac{d}{d x} [4])}{{(5 x^{5} + 4)}^{2}})$

Step 3.5.4

Since $5$ is constant with respect to $x$ , the derivative of $5 x^{5}$ with respect to $x$ is $5 \frac{d}{d x} [x^{5}]$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 (5 x^{5} + 4) x - x^{2} (5 \frac{d}{d x} [x^{5}] + \frac{d}{d x} [4])}{{(5 x^{5} + 4)}^{2}})$

Step 3.5.5

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 5$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 (5 x^{5} + 4) x - x^{2} (5 (5 x^{4}) + \frac{d}{d x} [4])}{{(5 x^{5} + 4)}^{2}})$

Step 3.5.6

Multiply $5$ by $5$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 (5 x^{5} + 4) x - x^{2} (25 x^{4} + \frac{d}{d x} [4])}{{(5 x^{5} + 4)}^{2}})$

Step 3.5.7

Since $4$ is constant with respect to $x$ , the derivative of $4$ with respect to $x$ is $0$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 (5 x^{5} + 4) x - x^{2} (25 x^{4} + 0)}{{(5 x^{5} + 4)}^{2}})$

Step 3.5.8

Simplify the expression.

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Step 3.5.8.1

Add $25 x^{4}$ and $0$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 (5 x^{5} + 4) x - x^{2} (25 x^{4})}{{(5 x^{5} + 4)}^{2}})$

Step 3.5.8.2

Multiply $25$ by $- 1$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 (5 x^{5} + 4) x - 25 x^{2} x^{4}}{{(5 x^{5} + 4)}^{2}})$

Step 3.6

Multiply $x^{2}$ by $x^{4}$ by adding the exponents.

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Step 3.6.1

Move $x^{4}$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 (5 x^{5} + 4) x - 25 (x^{4} x^{2})}{{(5 x^{5} + 4)}^{2}})$

Step 3.6.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 (5 x^{5} + 4) x - 25 x^{4 + 2}}{{(5 x^{5} + 4)}^{2}})$

Step 3.6.3

Add $4$ and $2$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (16 {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3} \frac{2 (5 x^{5} + 4) x - 25 x^{6}}{{(5 x^{5} + 4)}^{2}})$

Step 3.7

Combine $\frac{2 (5 x^{5} + 4) x - 25 x^{6}}{{(5 x^{5} + 4)}^{2}}$ and $16$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (\frac{(2 (5 x^{5} + 4) x - 25 x^{6}) \cdot 16}{{(5 x^{5} + 4)}^{2}} {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3})$

Step 3.8

Move $16$ to the left of $2 (5 x^{5} + 4) x - 25 x^{6}$ .

$\frac{1}{{(\frac{4 x^{2}}{5 x^{5} + 4})}^{4}} (\frac{16 \cdot (2 (5 x^{5} + 4) x - 25 x^{6})}{{(5 x^{5} + 4)}^{2}} {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3})$

Step 3.9

Simplify.

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Step 3.9.1

Apply the product rule to $\frac{4 x^{2}}{5 x^{5} + 4}$ .

$\frac{1}{\frac{{(4 x^{2})}^{4}}{{(5 x^{5} + 4)}^{4}}} (\frac{16 (2 (5 x^{5} + 4) x - 25 x^{6})}{{(5 x^{5} + 4)}^{2}} {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3})$

Step 3.9.2

Apply the product rule to $4 x^{2}$ .

$\frac{1}{\frac{4^{4} {(x^{2})}^{4}}{{(5 x^{5} + 4)}^{4}}} (\frac{16 (2 (5 x^{5} + 4) x - 25 x^{6})}{{(5 x^{5} + 4)}^{2}} {(\frac{4 x^{2}}{5 x^{5} + 4})}^{3})$

Step 3.9.3

Apply the product rule to $\frac{4 x^{2}}{5 x^{5} + 4}$ .

$\frac{1}{\frac{4^{4} {(x^{2})}^{4}}{{(5 x^{5} + 4)}^{4}}} (\frac{16 (2 (5 x^{5} + 4) x - 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{{(4 x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.4

Apply the product rule to $4 x^{2}$ .

$\frac{1}{\frac{4^{4} {(x^{2})}^{4}}{{(5 x^{5} + 4)}^{4}}} (\frac{16 (2 (5 x^{5} + 4) x - 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.5

Apply the distributive property.

$\frac{1}{\frac{4^{4} {(x^{2})}^{4}}{{(5 x^{5} + 4)}^{4}}} (\frac{16 ((2 (5 x^{5}) + 2 \cdot 4) x - 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.6

Apply the distributive property.

$\frac{1}{\frac{4^{4} {(x^{2})}^{4}}{{(5 x^{5} + 4)}^{4}}} (\frac{16 (2 (5 x^{5}) x + 2 \cdot 4 x - 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.7

Apply the distributive property.

$\frac{1}{\frac{4^{4} {(x^{2})}^{4}}{{(5 x^{5} + 4)}^{4}}} (\frac{16 (2 (5 x^{5}) x) + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8

Combine terms.

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Step 3.9.8.1

Raise $4$ to the power of $4$ .

$\frac{1}{\frac{256 {(x^{2})}^{4}}{{(5 x^{5} + 4)}^{4}}} (\frac{16 (2 (5 x^{5}) x) + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.2

Multiply the exponents in ${(x^{2})}^{4}$ .

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Step 3.9.8.2.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{1}{\frac{256 x^{2 \cdot 4}}{{(5 x^{5} + 4)}^{4}}} (\frac{16 (2 (5 x^{5}) x) + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.2.2

Multiply $2$ by $4$ .

$\frac{1}{\frac{256 x^{8}}{{(5 x^{5} + 4)}^{4}}} (\frac{16 (2 (5 x^{5}) x) + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.3

Multiply by the reciprocal of the fraction to divide by $\frac{256 x^{8}}{{(5 x^{5} + 4)}^{4}}$ .

$1 \frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{16 (2 (5 x^{5}) x) + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.4

Multiply $\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}}$ by $1$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{16 (2 (5 x^{5}) x) + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.5

Multiply $5$ by $2$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{16 (10 x^{5} x) + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.6

Raise $x$ to the power of $1$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{16 (10 (x^{1} x^{5})) + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.7

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{16 (10 x^{1 + 5}) + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.8

Add $1$ and $5$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{16 (10 x^{6}) + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.9

Multiply $10$ by $16$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{160 x^{6} + 16 (2 \cdot 4 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.10

Multiply $2$ by $4$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{160 x^{6} + 16 (8 x) + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.11

Multiply $8$ by $16$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{160 x^{6} + 128 x + 16 (- 25 x^{6})}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.12

Multiply $- 25$ by $16$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{160 x^{6} + 128 x - 400 x^{6}}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.13

Subtract $400 x^{6}$ from $160 x^{6}$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{- 240 x^{6} + 128 x}{{(5 x^{5} + 4)}^{2}} \cdot \frac{4^{3} {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.14

Raise $4$ to the power of $3$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{- 240 x^{6} + 128 x}{{(5 x^{5} + 4)}^{2}} \cdot \frac{64 {(x^{2})}^{3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.15

Multiply the exponents in ${(x^{2})}^{3}$ .

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Step 3.9.8.15.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{- 240 x^{6} + 128 x}{{(5 x^{5} + 4)}^{2}} \cdot \frac{64 x^{2 \cdot 3}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.15.2

Multiply $2$ by $3$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} (\frac{- 240 x^{6} + 128 x}{{(5 x^{5} + 4)}^{2}} \cdot \frac{64 x^{6}}{{(5 x^{5} + 4)}^{3}})$

Step 3.9.8.16

Multiply $\frac{- 240 x^{6} + 128 x}{{(5 x^{5} + 4)}^{2}}$ by $\frac{64 x^{6}}{{(5 x^{5} + 4)}^{3}}$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} \cdot \frac{(- 240 x^{6} + 128 x) (64 x^{6})}{{(5 x^{5} + 4)}^{2} {(5 x^{5} + 4)}^{3}}$

Step 3.9.8.17

Multiply ${(5 x^{5} + 4)}^{2}$ by ${(5 x^{5} + 4)}^{3}$ by adding the exponents.

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Step 3.9.8.17.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} \cdot \frac{(- 240 x^{6} + 128 x) (64 x^{6})}{{(5 x^{5} + 4)}^{2 + 3}}$

Step 3.9.8.17.2

Add $2$ and $3$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} \cdot \frac{(- 240 x^{6} + 128 x) (64 x^{6})}{{(5 x^{5} + 4)}^{5}}$

Step 3.9.8.18

Move $64$ to the left of $- 240 x^{6} + 128 x$ .

$\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}} \cdot \frac{64 \cdot (- 240 x^{6} + 128 x) x^{6}}{{(5 x^{5} + 4)}^{5}}$

Step 3.9.8.19

Multiply $\frac{{(5 x^{5} + 4)}^{4}}{256 x^{8}}$ by $\frac{64 (- 240 x^{6} + 128 x) x^{6}}{{(5 x^{5} + 4)}^{5}}$ .

$\frac{{(5 x^{5} + 4)}^{4} (64 (- 240 x^{6} + 128 x) x^{6})}{256 x^{8} {(5 x^{5} + 4)}^{5}}$

Step 3.9.8.20

Move $64$ to the left of ${(5 x^{5} + 4)}^{4}$ .

$\frac{64 \cdot {(5 x^{5} + 4)}^{4} (- 240 x^{6} + 128 x) x^{6}}{256 x^{8} {(5 x^{5} + 4)}^{5}}$

Step 3.9.8.21

Cancel the common factor of $64$ and $256$ .

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Step 3.9.8.21.1

Factor $64$ out of $64 {(5 x^{5} + 4)}^{4} (- 240 x^{6} + 128 x) x^{6}$ .

$\frac{64 (({(5 x^{5} + 4)}^{4} (- 240 x^{6} + 128 x)) x^{6})}{256 x^{8} {(5 x^{5} + 4)}^{5}}$

Step 3.9.8.21.2

Cancel the common factors.

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Step 3.9.8.21.2.1

Factor $64$ out of $256 x^{8} {(5 x^{5} + 4)}^{5}$ .

$\frac{64 (({(5 x^{5} + 4)}^{4} (- 240 x^{6} + 128 x)) x^{6})}{64 (4 x^{8} {(5 x^{5} + 4)}^{5})}$

Step 3.9.8.21.2.2

Cancel the common factor.

$\frac{64 (({(5 x^{5} + 4)}^{4} (- 240 x^{6} + 128 x)) x^{6})}{64 (4 x^{8} {(5 x^{5} + 4)}^{5})}$

Step 3.9.8.21.2.3

Rewrite the expression.

$\frac{({(5 x^{5} + 4)}^{4} (- 240 x^{6} + 128 x)) x^{6}}{4 x^{8} {(5 x^{5} + 4)}^{5}}$

Step 3.9.8.22

Cancel the common factor of ${(5 x^{5} + 4)}^{4}$ and ${(5 x^{5} + 4)}^{5}$ .

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Step 3.9.8.22.1

Factor ${(5 x^{5} + 4)}^{4}$ out of $({(5 x^{5} + 4)}^{4} (- 240 x^{6} + 128 x)) x^{6}$ .

$\frac{{(5 x^{5} + 4)}^{4} ((- 240 x^{6} + 128 x) x^{6})}{4 x^{8} {(5 x^{5} + 4)}^{5}}$

Step 3.9.8.22.2

Cancel the common factors.

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Step 3.9.8.22.2.1

Factor ${(5 x^{5} + 4)}^{4}$ out of $4 x^{8} {(5 x^{5} + 4)}^{5}$ .

$\frac{{(5 x^{5} + 4)}^{4} ((- 240 x^{6} + 128 x) x^{6})}{{(5 x^{5} + 4)}^{4} (4 x^{8} (5 x^{5} + 4))}$

Step 3.9.8.22.2.2

Cancel the common factor.

$\frac{{(5 x^{5} + 4)}^{4} ((- 240 x^{6} + 128 x) x^{6})}{{(5 x^{5} + 4)}^{4} (4 x^{8} (5 x^{5} + 4))}$

Step 3.9.8.22.2.3

Rewrite the expression.

$\frac{(- 240 x^{6} + 128 x) x^{6}}{4 x^{8} (5 x^{5} + 4)}$

Step 3.9.8.23

Cancel the common factor of $x^{6}$ and $x^{8}$ .

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Step 3.9.8.23.1

Factor $x^{6}$ out of $(- 240 x^{6} + 128 x) x^{6}$ .

$\frac{x^{6} ((- 240 + 128 x^{- 5}) x^{6})}{4 x^{8} (5 x^{5} + 4)}$

Step 3.9.8.23.2

Cancel the common factors.

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Step 3.9.8.23.2.1

Factor $x^{6}$ out of $4 x^{8} (5 x^{5} + 4)$ .

$\frac{x^{6} ((- 240 + 128 x^{- 5}) x^{6})}{x^{6} (4 x^{2} (5 x^{5} + 4))}$

Step 3.9.8.23.2.2

Cancel the common factor.

$\frac{x^{6} ((- 240 + 128 x^{- 5}) x^{6})}{x^{6} (4 x^{2} (5 x^{5} + 4))}$

Step 3.9.8.23.2.3

Rewrite the expression.

$\frac{(- 240 + 128 x^{- 5}) x^{6}}{4 x^{2} (5 x^{5} + 4)}$

Step 3.9.8.24

Cancel the common factor of $- 240 + 128 x^{- 5}$ and $4$ .

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Step 3.9.8.24.1

Factor $4$ out of $(- 240 + 128 x^{- 5}) x^{6}$ .

$\frac{4 ((- 60 + 32 x^{- 5}) x^{6})}{4 x^{2} (5 x^{5} + 4)}$

Step 3.9.8.24.2

Cancel the common factors.

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Step 3.9.8.24.2.1

Factor $4$ out of $4 x^{2} (5 x^{5} + 4)$ .

$\frac{4 ((- 60 + 32 x^{- 5}) x^{6})}{4 (x^{2} (5 x^{5} + 4))}$

Step 3.9.8.24.2.2

Cancel the common factor.

$\frac{4 ((- 60 + 32 x^{- 5}) x^{6})}{4 (x^{2} (5 x^{5} + 4))}$

Step 3.9.8.24.2.3

Rewrite the expression.

$\frac{(- 60 + 32 x^{- 5}) x^{6}}{x^{2} (5 x^{5} + 4)}$

Step 3.9.8.25

Cancel the common factor of $x^{6}$ and $x^{2}$ .

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Step 3.9.8.25.1

Factor $x^{2}$ out of $(- 60 + 32 x^{- 5}) x^{6}$ .

$\frac{x^{2} ((- 60 + 32 x^{- 5}) x^{4})}{x^{2} (5 x^{5} + 4)}$

Step 3.9.8.25.2

Cancel the common factors.

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Step 3.9.8.25.2.1

Cancel the common factor.

$\frac{x^{2} ((- 60 + 32 x^{- 5}) x^{4})}{x^{2} (5 x^{5} + 4)}$

Step 3.9.8.25.2.2

Rewrite the expression.

$\frac{(- 60 + 32 x^{- 5}) x^{4}}{5 x^{5} + 4}$

Step 3.9.9

Reorder terms.

$\frac{x^{4} (- 60 + 32 x^{- 5})}{5 x^{5} + 4}$

Step 3.9.10

Simplify the numerator.

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Step 3.9.10.1

Factor $4$ out of $- 60 + 32 x^{- 5}$ .

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Step 3.9.10.1.1

Factor $4$ out of $- 60$ .

$\frac{x^{4} (4 (- 15) + 32 x^{- 5})}{5 x^{5} + 4}$

Step 3.9.10.1.2

Factor $4$ out of $32 x^{- 5}$ .

$\frac{x^{4} (4 (- 15) + 4 (8 x^{- 5}))}{5 x^{5} + 4}$

Step 3.9.10.1.3

Factor $4$ out of $4 (- 15) + 4 (8 x^{- 5})$ .

$\frac{x^{4} (4 (- 15 + 8 x^{- 5}))}{5 x^{5} + 4}$

Step 3.9.10.2

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{x^{4} (4 (- 15 + 8 \frac{1}{x^{5}}))}{5 x^{5} + 4}$

Step 3.9.10.3

Combine $8$ and $\frac{1}{x^{5}}$ .

$\frac{x^{4} \cdot 4 (- 15 + \frac{8}{x^{5}})}{5 x^{5} + 4}$

Step 3.9.10.4

To write $- 15$ as a fraction with a common denominator, multiply by $\frac{x^{5}}{x^{5}}$ .

$\frac{x^{4} \cdot 4 (- 15 \cdot \frac{x^{5}}{x^{5}} + \frac{8}{x^{5}})}{5 x^{5} + 4}$

Step 3.9.10.5

Combine $- 15$ and $\frac{x^{5}}{x^{5}}$ .

$\frac{x^{4} \cdot 4 (\frac{- 15 x^{5}}{x^{5}} + \frac{8}{x^{5}})}{5 x^{5} + 4}$

Step 3.9.10.6

Combine the numerators over the common denominator.

$\frac{x^{4} \cdot 4 \frac{- 15 x^{5} + 8}{x^{5}}}{5 x^{5} + 4}$

Step 3.9.10.7

Combine exponents.

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Step 3.9.10.7.1

Combine $x^{4}$ and $\frac{- 15 x^{5} + 8}{x^{5}}$ .

$\frac{4 \frac{x^{4} (- 15 x^{5} + 8)}{x^{5}}}{5 x^{5} + 4}$

Step 3.9.10.7.2

Combine $4$ and $\frac{x^{4} (- 15 x^{5} + 8)}{x^{5}}$ .

$\frac{\frac{4 (x^{4} (- 15 x^{5} + 8))}{x^{5}}}{5 x^{5} + 4}$

Step 3.9.10.8

Remove unnecessary parentheses.

$\frac{\frac{4 x^{4} (- 15 x^{5} + 8)}{x^{5}}}{5 x^{5} + 4}$

Step 3.9.10.9

Reduce the expression $\frac{4 x^{4} (- 15 x^{5} + 8)}{x^{5}}$ by cancelling the common factors.

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Step 3.9.10.9.1

Factor $x^{4}$ out of $4 x^{4} (- 15 x^{5} + 8)$ .

$\frac{\frac{x^{4} (4 (- 15 x^{5} + 8))}{x^{5}}}{5 x^{5} + 4}$

Step 3.9.10.9.2

Factor $x^{4}$ out of $x^{5}$ .

$\frac{\frac{x^{4} (4 (- 15 x^{5} + 8))}{x^{4} x}}{5 x^{5} + 4}$

Step 3.9.10.9.3

Cancel the common factor.

$\frac{\frac{x^{4} (4 (- 15 x^{5} + 8))}{x^{4} x}}{5 x^{5} + 4}$

Step 3.9.10.9.4

Rewrite the expression.

$\frac{\frac{4 (- 15 x^{5} + 8)}{x}}{5 x^{5} + 4}$

Step 3.9.11

Multiply the numerator by the reciprocal of the denominator.

$\frac{4 (- 15 x^{5} + 8)}{x} \cdot \frac{1}{5 x^{5} + 4}$

Step 3.9.12

Multiply $\frac{4 (- 15 x^{5} + 8)}{x}$ by $\frac{1}{5 x^{5} + 4}$ .

$\frac{4 (- 15 x^{5} + 8)}{x (5 x^{5} + 4)}$

Step 3.9.13

Factor $- 1$ out of $- 15 x^{5}$ .

$\frac{4 (- (15 x^{5}) + 8)}{x (5 x^{5} + 4)}$

Step 3.9.14

Rewrite $8$ as $- 1 (- 8)$ .

$\frac{4 (- (15 x^{5}) - 1 (- 8))}{x (5 x^{5} + 4)}$

Step 3.9.15

Factor $- 1$ out of $- (15 x^{5}) - 1 (- 8)$ .

$\frac{4 (- (15 x^{5} - 8))}{x (5 x^{5} + 4)}$

Step 3.9.16

Rewrite $- (15 x^{5} - 8)$ as $- 1 (15 x^{5} - 8)$ .

$\frac{4 (- 1 (15 x^{5} - 8))}{x (5 x^{5} + 4)}$

Step 3.9.17

Move the negative in front of the fraction.

$- \frac{4 (15 x^{5} - 8)}{x (5 x^{5} + 4)}$

Step 4

Reform the equation by setting the left side equal to the right side.

$y' = - \frac{4 (15 x^{5} - 8)}{x (5 x^{5} + 4)}$

Step 5

Replace $y'$ with $\frac{d y}{d x}$ .

$\frac{d y}{d x} = - \frac{4 (15 x^{5} - 8)}{x (5 x^{5} + 4)}$